延气2井区盒8段致密砂岩储层非均质性特征

Heterogeneity of the Tight Sandstone Reservoirs in the 8th Member of Shihezi Formation,Yanqi2 Area

储层非均质性直接影响着砂层内油气的动用程度。通过测井、录井和测试分析资料,对延气2井区盒8段储层非均质性进行了深入讨论。研究区盒8段层内非均质性特征包括两类:垂向加积多河道叠置砂体呈现的正韵律,以及进积的河口坝砂体呈现的反韵律非均质特征,盒8下层内非均质性更强。层间隔层以盒8上亚段更发育。平面上储层特征存在东、西差异,砂体以东部、东南部最为发育。综合分析认为:盒8下部砂层组,以及盒8上部河口坝砂层顶部为研究区最有利储层段,且这些连通性能很好的高孔、高渗带集中分布在研究区中部,开发中要特别注意多变韵律层内的含水动态监测,并以南部为下步重点扩边方向。

Reservoir heterogeneity directly affects the reservoir producing degree. Therefore,this paper intends to make a depth analysis of heterogeneity in the 8th member of the Shihezi formation,by using well logging,mud log-ging information and core analysis data. According to the analysis,multiple channel vertical deposited sandstone reservoir with positive rhythm,mouth bar sand with reverse rhythm mainly,which is the two types in He8 forma-tion,the heterogeneity is stronger in the upper part of he8 formation. Meanwhile,the restraining barrier is more de-veloped in the lower part of He8 formation. In addition,the reservoir characteristics presents the east-west differ-ence in a plane,with the sand is most developed in the east,southeast area. To sum up,the sandstone in lower part and the top of mouth bar sand in upper part of he8 formation is the most favorable place,with high porosity and per-meability,is good connectivity,concentrated in the middle of the study area. Further more,we should pay special attention to the water dynamic monitoring of polytropic rhythmic layer,and southern of the area is the further expan-sion direction.